Primer for ethylene/tetrafluoroethylene copolymer coating materials

Patent metadata

Field	Value
Publication number	US-11827801-B2
Application number	US-202117532461-A
Country	US
Kind code	B2
Filing date	Nov 22, 2021
Priority date	May 31, 2019
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A primer for an ETFE coating material containing: ethylene/tetrafluoroethylene copolymer (ETFE) particles; a heat-resistant resin; and a nonionic surfactant. The ETFE particles have an average particle size of 5.0 to 50 μm. The heat-resistant resin includes at least one selected from polyamide-imide resin, polyethersulfone resin, and polyimide resin. The ETFE particles and the heat-resistant resin have a solid content ratio by mass of 60:40 to 90:10. The nonionic surfactant includes a polyoxyethylene alkyl ether surfactant. Also disclosed is a primer film obtained from the primer for an ETFE coating material as well as a coated article.

First claim

The invention claimed is:

1. A primer for an ETFE coating material comprising:
ethylene/tetrafluoroethylene copolymer (ETFE) particles;
a heat-resistant resin; and
a nonionic surfactant,
the ETFE particles having an average particle size of 5.0 to 50 μm,
the heat-resistant resin including at least one selected from the group consisting of polyamide-imide resin, polyethersulfone resin, and polyimide resin,
the ETFE particles and the heat-resistant resin having a solid content ratio by mass of 60:40 to 90:10,
the nonionic surfactant including a polyoxyethylene alkyl ether surfactant.

2. The primer for an ETFE coating material according to claim 1 , further comprising at least one dispersion medium selected from the group consisting of water, an alcohol, a ketone, an ester, and an aromatic hydrocarbon.

3. The primer for an ETFE coating material according to claim 1 ,
wherein the primer for an ETFE coating material contains no or less than 0.1% by mass in total of N-methyl-2-pyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, and γ-butyrolactone relative to the primer for an ETFE coating material.

4. The primer for an ETFE coating material according to claim 1 , further comprising a heat-resistant-resin-dissolving solvent for dissolving the heat-resistant resin,
wherein the heat-resistant-resin-dissolving solvent is present in an amount of 10% by mass or more relative to the heat-resistant resin.

5. The primer for an ETFE coating material according to claim 1 ,
wherein ETFE constituting the ETFE particles contains a polymerized unit (a) based on ethylene, a polymerized unit (b) based on tetrafluoroethylene, and a polymerized unit (c) based on a third component, and
the third component includes at least one selected from the group consisting of CH 2 ═CF(CF 2 ) 3 H, CH 2 ═CH(CF 2 ) 6 F, and CH 2 ═CH(CF 2 ) 4 F.

6. The primer for an ETFE coating material according to claim 1 ,
wherein ETFE constituting the ETFE particles has a melt flow rate of 0.1 to 100 g/10 min.

7. The primer for an ETFE coating material according to claim 1 , further comprising a heat stabilizer in an amount of 0.001 to 5% by mass relative to a solid content of the ETFE particles.

8. A primer film obtained from the primer for an ETFE coating material according to claim 1 .

9. A coated article comprising:
a subject to be coated;
the primer film according to claim 8 on the subject to be coated; and
an ETFE film on the primer film.

Assignees

• Daikin Ind Ltd

Inventors

• Imada Hirotake
• Nakatani Yasukazu

Classifications

• C09D127/18 Primary

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C09D5/002 Primary

  Priming paints (C09D5/08 takes precedence) · CPC title

• C09D7/20

  Diluents or solvents · CPC title

• C09D7/63

  organic · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title